But what if the username you wanted is no longer available? What if your name, your business name or some other element of your identity is gone. This happened to Michael Arrington of TechCrunch and, most likely thousands of others.
If this happened to you, the good news is that you may have rights you can protect, especially if you are facing an obvious namesquatter, but it may be very difficult enforcing those rights on either site due to the nature of the law and the nature of Facebook and Twitter as companies.